WS+B has seven offices, while prior to the union Mendlowitz Weitsen had two, including one in New York City.

"They have a very similar culture to ours and a quality practice," said WS+B managing director Ivan Brown. "They're very active in the profession and have a good history of staff retention. They also have clients in areas like mortgage banking and mutual funds, and both our firms do a lot of work in succession planning."

Brown said that merger discussions began in June.

Edward Mendlowitz said that the merger would allow MW clients access to additional services, such as manufacturing, mortgage banking, technology, distribution management, construction contracting, litigation support and forensic accounting.

In addition to tax and auditing, Mendlowitz Weitsen, which was founded in 1988, also has niche services in the areas of personal financial planning, business valuations and corporate training.